Magnetically tunable Feshbach resonances in ultracold gases of europium atoms and mixtures of europium and alkali-metal atoms

Klaudia Zaremba-Kopczyk, Piotr S. Żuchowski, and Michał Tomza
Phys. Rev. A 98, 032704 – Published 14 September 2018

Abstract

We investigate magnetically tunable Feshbach resonances between ultracold europium atoms and between europium and alkali-metal atoms using multichannel quantum scattering calculations. For ultracold gases of europium atoms both homonuclear Eu153+Eu153 and heteronuclear Eu151+Eu153 systems are studied. Calculations for mixtures of europium and alkali-metal atoms are carried out for prototype systems of Eu153+Rb87 and Eu153+Li7. We analyze the prospects for the control of scattering properties, observation of quantum chaotic behavior, and magnetoassociation into ultracold polar and paramagnetic molecules. We show that favorable resonances can be expected at experimentally feasible magnetic-field strengths below 1000G for all investigated atomic combinations. For Eu atoms, a rich spectrum of resonances is expected as a result of the competition between relatively weak short-range spin-exchange and strong long-range magnetic dipole-dipole interactions, where the dipolar interaction induces measurable resonances. A high density of resonances is expected at magnetic-field strengths below 200G without pronounced quantum chaos signatures. The present results may be useful for the realization and application of dipolar atomic and molecular quantum gases based on europium atoms in many-body physics.

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  • Received 6 June 2018

DOI:https://doi.org/10.1103/PhysRevA.98.032704

©2018 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Klaudia Zaremba-Kopczyk1, Piotr S. Żuchowski2, and Michał Tomza1,*

  • 1Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
  • 2Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Torun, Grudziadzka 5, 87-100 Toruń, Poland

  • *michal.tomza@fuw.edu.pl

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Vol. 98, Iss. 3 — September 2018

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